The car was running a sluggish and loud so I decided to try a valve adjustment for the first time. That seemed to go well so I figured I’d try to tune the carb while I had the air cleaner cover off. I was trying the lean idle drop method that has been posted about a lot on this forum. I closed the mixture adjusting screw and then opened it 1 and 1/2 turns. I then mistakenly started messing with the fast idle screw instead of the idle speed adjusting screw. I wanted to try to get a steady idle. Now, the car will start up very rough for a few seconds and die. I can’t get it to start up again and idle. Does anyone have any suggestions on what I might have done wrong?